SEMTECH SC630A

SC630A 1MHz Fixed 3.3V Output Charge Pump Regulator POWER MANAGEMENT Features Description  Input voltage range — 2.95V to 5.5V The SC630A is a high-current voltage regulator using  V tolerance — 3.3V ±3% Semtech’s proprietary low-noise charge pump technol- OUT  Continuous output current — 300mA max ogy. The charge pump provides a low EMI solution  Three charge pump modes — x, .5x and 2x compared to inductive boost regulators. Performance is  Output ripple voltage — 33mV , typical optimized for use in single Li-Ion battery cell applications. PP  Short circuit, over-voltage, and over-temperature The regulator provides the performance of a linear, low protection drop-out (LDO) voltage regulator when the battery is  Soft-start functionality greater than 3.3V. Unlike an LDO, drop-out is avoided  Shutdown current — 0.µA, typical when the battery is less than 3.3V. Instead, a charge pump  Ultra thin package — 2 x 2 x 0.6 (mm) is activated to provide voltage boost and the head-room  Lead-free and halogen-free needed for regulation.  WEEE and RoHS compliant The SC630A’s charge pump has three modes of operation: Applications 2x, .5x, and x modes. The 2x and .5x modes deliver current to the load in each of two phases. The x mode  Mobile phones turns off the charge pump, delivering current through an  Tablets LDO. Hysteresis is provided to prevent chatter between  USB On-The-Go charge pump modes. When active, the charge pump pro-  Multi-LED backlit LCDs vides low-ripple operation at MHz. Typically the output  Compact flash/CF+ products ripple is % of the output voltage — 33mVpp at 25mA.  Digital video cameras  DVI/HDMI ports A small 2.2µF capacitor is recommended for all four capaci-  Wi-Fi base stations tors. The full rated output current is provided when 2.2µF  Modems is used for both bucket capacitors. At the output, a 2.2µF  Set-top boxes capacitor decouples the load and provides smoothing for mode transitions, while another 2.2µF is used to decouple the input. Typical Application Circuit V = 3.3V @ 300mA OUT IN OUT C C IN OUT V BAT 2.2µF 2.2µF SC630A C1+ Chip EN C 1 enable C1- 2.2µF C2+ C 2 GND 2.2µF C2- US Patent: 7,808,220 Rev. . © 20 Semtech Corporation  SC630A Pin Configuration Ordering Information Device Package ()(2) SC630AULTRT MLPD-UT-8 2x2 SC630AEVB Evaluation Board Notes: () Available in tape and reel only. A reel contains 3,000 devices. GND C2- 1 8 (2) Lead-free package only. Device is WEEE and RoHS compliant and TOP VIEW halogen free. C1+ 2 7 C2+ C1- 3 6 OUT T IN 5 EN 4 MLPD-UT-8; 2x2, 8 LEAD θ = 68°C/W JA Marking Information K0A yw yw = Datecode 2 SC630A Absolute Maximum Ratings Recommended Operating Conditions IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 Ambient Temperature Range (°C) . . . . . . . . -40 < T < +85 A C+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to (V + 0.3) IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.95 < V < 5.5 OUT IN Pin Voltage - All Other Pins (V) . . . . . . . . . . . -0.3 to (V + 0.3) IN OUT Short Circuit Duration . . . . . . . . . . . . . . . . . Continuous Thermal Information () ESD Protection Level (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 (2) Thermal Resistance, Junction to Ambient (°C/W) . . . . . 68 Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +50 Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +50 Peak IR Reflow Temperature (0s to 30s) (°C) . . . . . . . +260 Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. NOTES () Tested according to JEDEC standard JESD22-A4-B. (2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5 standards. Electrical Characteristics Unless otherwise specified: T = +25°C for Typ, -40°C to +85°C for Min and Max; C = C = 2.2µF (ESR < 0.03Ω); C = C = 22µF; V = 2.95V to 5.5V A  2 IN OUT IN Parameter Symbol Condition Min Typ Max Units Output Voltage V V = 4.2V, I = mA 3.2 3.3 3.4 V OUT IN OUT Output Voltage Ripple V I = 25mA 33 mV PP OUT Continuous Load, 2.95V ≤ V ≤ 5.5V, x or .5x mode 300 mA IN Shutdown Current I Shutdown (EN = GND), V = 3.6V 0. 2 µA SD IN Total Quiescent Current I EN high, I = mA 2.5 3.5 mA Q OUT Charge Pump Frequency f V = 3.2V  MHz PUMP IN (EN transitions from low to high), Start-Up Time t 400 µs SU 3.2V ≤ V ≤ 3.4V, No load OUT Line Regulation ΔV I = mA, 2.95V ≤ V ≤ 4.2V 2 mV LINE OUT IN Load Regulation ΔV V Fixed, mA ≤ I ≤ 300mA 25 mV LOAD IN OUT EN Input High Threshold V V = 5.5V .6 V IH IN EN Input Low Threshold V V = 2.7V 0.4 V IL IN EN Input High Current I V = 5.5V 2 µA IH IN 3 SC630A Electrical Characteristics (continued) Parameter Symbol Condition Min Typ Max Units EN Input Low Current I V = 5.5V 2 µA IL IN x mode 0.3 Ω Open-Loop Output Resistance R .5x mode, V = 3.08V 4.5 Ω OUT IN 2x mode, V = 2.95V 2.6 Ω IN V I = 300mA 3.35 V TRANS X OUT (2) Mode Transition Voltage V I = 300mA 3.08 V TRANS .5X OUT Fault Protection Short-Circuit Current I V = 0V, I = I 300 600 980 mA SC OUT OUT IN x mode 0.6 .2 2.0 A Input Current Limit I .5x and 2x modes .2 2.0 2.8 A LIMIT V ≤ 2V, I = I 700 mA OUT OUT IN T Rising Threshold 65 °C OTP (3) Over Temperature T Hysteresis 20 °C HYS Notes: () Thermal limitation is dependent upon the thermal performance of the printed circuit board in support of the package standard of 68° C/W. (2) Voltage at the IN pin is where a mode transition takes place in the charge pump with V falling. IN (3) Guaranteed by design — not tested in production 4 SC630A Typical Characteristics Line Regulation Load Regulation V = 3.3V, V = 3.6V V = 3.3V, I = 1mA OUT IN OUT OUT -25 20 15 25°C -20 10 85°C 5 -15 -40°C 0 T =85°C A PSRR — 1x Mode -10 TA=25°C -5 T =-40°C A -10 -5 -15 0 -20 0 100 150 200 250 300 350 50 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Output Current (mA) Input Voltage (V) Efficiency versus Load Current Output Ripple V = 3.3V OUT V = 3.3V, C = C = C = C = 2.2µf (0603) OUT IN OUT 1 2 100 100 V = 3.4V IN 1.5x and 2x mode V = 3.6V IN 90 80 V = 3.8V IN V = 4.0V IN 80 60 300mA 70 40 200mA 100mA 20 60 50mA 10mA 1x mode 50 0 0 50 100 150 250 300 350 5.6 5.2 4.8 4.0 3.6 3.2 2.8 200 4.4 Load Current (mA) Input Voltage (V) PSRR — 1.5x Mode PSRR — 1x Mode V = 3.2V, V = 3.3V, I = 50mA IN OUT OUT V = 4.2V, V = 3.3V, I = 50mA IN OUT OUT 0 0 C = C = C = C = 2.2µF (0603) C = C = C = C = 2.2µF (0603) IN OUT  2 IN OUT  2 -10 -10 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 -70 -70 -80 -80 -90 -90 -100 -100 10 100 1000 10000 10 100 10000 1000 Frequency (Hz) Frequency (Hz) 5 Output Voltage Variation —ΔV (mV) Gain (dB) LOAD Efficiency (%) Output Voltage Variation —ΔV (mV) Gain (dB) Ripple (mV p-p) LINE SC630A Typical Characteristics (continued) Efficiency — 10mA Efficiency — 50mA V = 3.3V, I = 50mA OUT OUT V = 3.3V, I = 10mA OUT OUT 100 100 90 90 80 80 1x Mode Mode 70 70 Transition 1x Mode Hysteresis Mode 1.5x Mode Transition 60 60 Hysteresis 1.5x Mode 50 50 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 Input Voltage (V) Input Voltage (V) Efficiency — 100mA Efficiency — 200mA V = 2.95V, I = 100mA OUT OUT V = 3.3V, I = 200mA OUT OUT 100 100 90 90 1x Mode 80 80 1x Mode Mode Mode 70 70 Transition Transition Hysteresis Hysteresis 1.5x Mode 1.5x Mode 60 60 2x Mode 50 50 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 Input Voltage (V) Input Voltage (V) Efficiency — 300mA V = 3.3V, I = 300mA OUT OUT 100 90 1x Mode 80 1.5x Mode 70 Mode Transition Hysteresis 60 50 2x Mode 40 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 Input Voltage (V) 6 Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) SC630A Typical Characteristics (continued) Ripple — 1.5x Mode Ripple — 1x Mode V = 3.6V, V = 3.3V, I = 25mA V = 3.2V, V = 3.3V, I = 25mA IN OUT OUT IN OUT OUT V (00mV/div) IN -PP V (00mV/div) IN -PP V (00mV/div) V (00mV/div) OUT -PP OUT -PP 25mA 25mA I (200mA/div) I (200mA/div) OUT OUT 0mA C =C =C =C =2.2µF (0603) 0mA C =C =C =C =2.2µF (0603) IN OUT  2 IN OUT  2 Time (1µs/div) Time (1µs/div) Ripple — 2x Mode Startup (No Load) V = 2.85V, V = 3.3V, I = 25mA V = 3.6V, I = 0mA IN OUT OUT IN OUT V (2V/div)– EN V (00mV/div) IN -PP 0V— V (00mV/div) OUT -PP V (2V/div)–– OUT 0V— 25mA I (200mA/div) OUT I (200mA/div)– OUT 0V— 0mA C =C =C =C =2.2µF (0603) IN OUT  2 C =C =C =C =2.2µF (0603) IN OUT  2 Time (200µs/div) Time (1µs/div) Quiescent Current Startup (215mA) V = 3.6V, I = 25mA IN OUT V = 3.3V, I = 1mA OUT OUT 2.5 V (2V/div)– EN 2 0V— 85°C 1.5 25°C -45°C V (2V/div)–– OUT 1 0V— I (200mA/div)– 0.5 OUT 0V— C =C =C =C =2.2µF (0603) IN OUT  2 0 5.6 5.2 4.8 4.4 4 3.6 3.2 2.8 Time (200µs/div) V (V) IN 7 I (mA) Q SC630A Pin Descriptions Pin Pin Name Pin Function  GND Ground — connect to ground plane with multiple vias 2 C+ Positive terminal of bucket capacitor  3 C- Negative terminal of bucket capacitor  4 IN Input supply voltage 5 EN Chip enable — active-high 6 OUT Output 7 C2+ Positive terminal of bucket capacitor 2 8 C2- Negative terminal of bucket capacitor 2 This pad is for heat sinking and is not connected internally. It must be connected to a ground plane using T Thermal Pad multiple vias. 8 SC630A Block Diagram IN 4 LDO 2 C1+ 1MHz 3 C1- 7 C2+ Logic EN 5 8 Control C2- CHARGE PUMP 6 OUT Reference Voltage Generator 1 GND 9 SC630A Applications Information General Description Temperature Derating The SC630A is a 3.3V output charge pump regulator The load current and battery voltage range of the appli- designed to support up to 300mA (T ≤ 85°C, 2.95V ≤ V ≤ cation should be compared with the efficiency plots on A IN 5.5V) of continuous current. It is used for powering Micro page 6 to determine if 2x mode is required by the appli- HDDs (Hard Disk Drives) and other 3.3V devices in porta- cation. The data provided in the following derating curve ble handheld equipment including Compact Flash and for 2x mode is based on the peak power dissipation that CF+ products. could occur while in 2x mode. x and .5x modes do not require derating. The SC630A has three operating modes — x, .5x, and 350 2x. The x mode is a linear series regulation mode with a low output resistance of only 300mΩ. The x mode func- 300 tions as a low noise series linear regulator. The .5x and 2x Derating for applications 250 modes are a low noise constant frequency, constant duty requiring 2x mode cycle switch mode, using two bucket capacitors. One 200 bucket supports the full output current while the other bucket charges from the input. The two buckets exchange 150 roles in the next phase, supplying continuous output 100 current in both phases and reducing the need for a large 35 45 55 65 75 85 95 105 Ambient Temperature (°C) output decoupling capacitor. The constant frequency, constant duty cycle operation also produces predictable Maximum Continuous Output constant frequency harmonics. Protection Circuitry Mode Transition Hysteresis The SC630A also provides protection circuitry that pre- Hysteresis is provided to prevent chatter between charge vents the device from operating in an unspecified state. pump modes. The hysteresis between charge pump These functions include: modes is shown in the efficiency plots of the Typical Characteristics section. For optimum transient perfor- • Over-Current Protection (OCP) mance, the input should be decoupled to prevent steps • Short-Circuit Current Protection (SCCP) greater than the hysteresis voltage. Note that hysteresis is • Over-Temperature Protection (OTP) load dependent, and increases with the load current to prevent chatter between the charge pump modes. Over-Current Protection Over-current protection is provided to limit the output Thermal Resistance current. When V is greater than 2V, OCP limits the OUT The SC630A package is thermally efficient when the output to A typical. The threshold at 2V allows the device circuit board layout connects the thermal pad through to recover from excessive voltage droop during an over multiple vias to the ground plane. The thermal resistance current. is dependent upon the connection between the thermal pad and the ground plane. A layout that is done correctly Short-Circuit Current Protection should keep the junction temperature below the over- Short-circuit current protection is provided to limit the temperature limit while operating the SC630A within the current that can be sourced when the output is shorted specified electrical conditions. A poor layout may allow to ground. When a short circuit forces V to drop below OUT the junction temperature to reach the over temperature 2V, the SCCP detects the condition and limits the output limit, so it is important to maintain adequate ground current to 600mA (typical). plane around the device to maximize heat transfer to the PCB. 0 I (mA) OUT SC630A Applications Information (continued) Over-Temperature Protection Table 1 — Recommended Capacitors The over-temperature circuit helps prevent the device Size Code Value from overheating and experiencing a catastrophic failure. Capacitor Notes mil(mm) μF When the junction temperature exceeds 65°C the device is disabled. It remains disabled until the junction tempera- This capacitor is required for C , C IN OUT ture drops below this threshold. Hysteresis is included the full rated output current. 0603(608) 2.2 that prevents the device from re-enabling until the junc- Typical output V < 00mV PP C C in all charge pump modes. tion temperature is reduced by 20°C. , 2 This capacitor combina- Capacitor Selection C , C IN OUT tion supports up to 200mA The SC630A is designed to use low-ESR ceramic capacitors 0402(005) 2.2 output current with typical for the input and output bypass capacitors as well as the output V < 00mV in all PP C C , 2 charge pump modes. charge pump bucket capacitors. The value of input, output This capacitor combina- and decoupling capacitors will vary with system require- C , C IN OUT tion supports up to 00mA ments for ripple and output current. Performance as 0402(005) 0.47 output current with typical shown in the Typical Characteristic section is expected output V < 00mV in all PP C C when using 2.2µF capacitors in the 0603(608 metric) case , 2 charge pump modes. size with X5R dielectric for C , C , C and C capacitors IN OUT  2 .0 C , C (refer to Table ). IN OUT This combination of capaci- tors support up to 00mA output current with typical Consider the DC voltage characteristic of the capacitor output V < 00mV in all when choosing capacitors for an application. The value of PP charge pump modes. capacitance at the DC operating voltage may be consider- 0402(005) ably lower than the rated value. The following table lists 0. C C , 2 The 0.µF bucket capacitors recommended capacitor values which have been chosen will increase output resis- to minimize the impact of this limitation. tance by 2.5Ω compared to 0.47µF and larger values. The highest capacitance values in the smallest package sizes tend to have poor DC voltage characteristics. The NOTE: Use only X5R type capacitors, with a 6.3V rating or higher highest value 0402 size capacitor retains as little as 35% of its rated value at 5VDC. The same value chosen in the next larger package size, 0603, will retain about 60% of its rated value at 5VDC.  SC630A Applications Information (continued) 2. Place the input and output decoupling capacitors PCB Layout Considerations as close as possible to the device and connect these Poor layout can degrade the performance of the regula- capacitors’ ground pads together to the ground plane tor and can be a contributory factor in EMI problems, using multiple vias through a short wide copper ground bounce, thermal issues, and resistive voltage area. losses. Poor regulation and instability can result. 3. Connect pin  directly to the copper area under the The following design rules are recommended: thermal pad. 4. The thermal pad at the center of the device is not . Place the bucket capacitors as close to the device as electrically connected. Connect this pad to the possible and on the same side of the board. Use short ground plane using multiple vias. wide copper areas between the capacitor pins and 5. Use a ground plane to further reduce noise the device pins. interference on sensitive circuit nodes. SC630A C 2 GND C2- C2+ C C1+ 1 GND C1- OUT EN IN C OUT C IN EN 2 SC630A Outline Drawing — MLPD-UT-8 2x2 B D A DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX - - E A .020 .024 0.50 0.60 PIN 1 - - A1 .000 .002 0.00 0.05 INDICATOR A2 (.006) (0.1524) (LASER MARK) b .007 .010 .012 0.18 0.25 0.30 D .075 .079 .083 1.90 2.00 2.10 D1 .061 .067 .071 1.55 1.70 1.80 E .075 .079 .083 1.90 2.00 2.10 E1 .026 .031 .035 0.65 0.80 0.90 e .020 BSC 0.50 BSC A SEATING L .012 .014 .016 0.30 0.35 0.40 PLANE aaa C N 8 8 aaa .003 0.08 A1 A2 C bbb .004 0.10 D1 1 2 LxN E/2 E1 N bxN e bbb C A B e/2 D/2 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 3 SC630A Land Pattern — MLPD-UT-8 2x2 H DIMENSIONS R DIM INCHES MILLIMETERS (.077) (1.95) C G .047 1.20 H .067 1.70 Z (C) K G K .031 0.80 P .020 0.50 R .006 0.15 Y X .012 0.30 Y .030 0.75 Z .106 2.70 P X NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. 2. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 3. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE. 4 SC630A © Semtech 20 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. 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